Hack Squat XJS Aakav Fitness is a common piece of strength training apparatus in gyms and fitness centers. It is made to support the user's neck and back while simulating the motion of a squat exercise. The device consists of a platform that the user stands on and a backrest or shoulder pads to support their upper bodies. Hack Squat XJS Aakav Fitness is safe to use. By using a machine, the user can concentrate more on these particular muscles and use fewer other muscles while exercising. The quadriceps, hamstrings, and glutes are the main leg muscles that this machine targets.